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Covalently grafted anion exchangers with linear epoxy-amine functionalities for high-performance ion chromatography
- Zhang, Kai, Lou, Chaoyan, Zhu, Yan, Zhi, Mingyu, Zeng, Xiuqiong, Shou, Dan
- Talanta 2019 v.194 pp. 485-492
- amines, chemical bonding, chemical species, crosslinking, electrolytes, hydrophilicity, ion exchange chromatography, models, polymerization, quaternary ammonium compounds
- Chemical constitution and construction of functional sites play a crucial part in the chromatographic behavior of stationary phases. We present novel polymeric anion exchangers covalently grafted with linear quaternary ammonium polyelectrolytes via simple one-step epoxy-amine polymerization. In separation of various anionic analytes, the newly developed anion exchangers showed high efficiency (e.g., >30,000 plates m−1 for chloride with hydroxide elution) and peculiar chromatographic behavior as compared to previously reported hyperbranched phases. By adopting different amines as the building unite of linear polyelectrolytes, the two types of model anion exchangers displayed segregated selectivity which in our opinion is associated with charge density, hydrophilicity and low cross-linking of the functionalities.